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SUMMARY:Cosmological Vacuum Decays from Schwinger-Keldysh Formalism
DTSTART;VALUE=DATE-TIME:20260422T020000Z
DTEND;VALUE=DATE-TIME:20260422T040000Z
DTSTAMP;VALUE=DATE-TIME:20260525T205945Z
UID:indico-event-436@indico.itp.ac.cn
DESCRIPTION:Speaker: 宇文子炎/Zi-Yan Yuwen（APCTP\, Pohang\, Korea）
 \n\nAbstract: In this talk\, we establish a systematic framework to descri
 be the vacuum decays in a radiation-dominated FLRW universe from the Schwi
 nger-Keldysh formalism. By splitting the phase transition field Φ into th
 e mean field ϕ and the short-wavelength modes σ and tracing over the lat
 ter as the environment\, we obtain a classical Langevin-type equation-of-m
 otion for the mean field ϕ\, where the quantum effects are encoded in a n
 on-Markov memory kernel and a non-Gaussian noise. As a phenomenological ex
 ample\, we consider a polynomial potential and study the structure of the 
 memory kernel as well as the correlation functions of the noise term. With
  a less restrictive scale split by allowing ϕ to carry spatial dependence
 \, further extensions remain possible to describe the whole dynamics of co
 smological first-order phase transitions via numerical simulations.\n\nBio
 graphy: 宇文子炎，2020年本科毕业于西安交通大学，2025年
 博士毕业于中国科学院理论物理研究所，博士期间于2024
 年--2025年在南非Stellenbosch大学物理系访问。自2025年至今
 为亚太理论物理中心（APCTP）YST博士后。研究方向为引力
 理论与宇宙学。在RPD，PRR，JCAP等期刊发表论文十余篇，
 被引200余次，并担任EPJC，CPC等杂志审稿人。目前的研究
 兴趣为宇宙学一阶相变现象学，原初黑洞形成机制，以
 及与21cm宇宙学相关的射电天文学内容。\n\nhttps://indico.itp
 .ac.cn/event/436/
LOCATION:ITP South Building 6620
URL:https://indico.itp.ac.cn/event/436/
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